TY - JOUR T1 - The extension group of the simple modules over the first Weyl algebra JO - Bulletin of the London Mathematical Society PY - 2000/01/01 AU - Bavula VV ED - DO - DOI: 10.1112/S0024609399006608 VL - 32 IS - 2 SP - 182 EP - 190 Y2 - 2025/04/10 ER -